Hub driven device and means and method for making the same



June 22, 1965 J. E. SADLER ETAL 3,190,134

HUB DRIVEN DEVICE AND MEANS AND METHOD FOR MAKING THE SAME Filed Aug. 9, 1963 :s sheets sheet 1 5%- I 1 k I 1 I I 7 I 'I s za- L 23 4 I l t aa 4 6'0 6 72 73 58 5? I 78 77 W i h a 80 4 l i INV EN TORS.

June 1965 J. E. SADLER ETAL 3,190,134

'HUB'DRIVEN DEVICE AND MEANS AND METHOD FOR MAKING THE SAME Filed Aug. 9, 1963 3 Sheets-Sheet 2 IN V EN TORS.

June 22, 1965 J, SADLER ETAL 3,190,134

HUB DRIVEN DEVICE AND MEANS AND METHOD FOR MAKING THE SAME Filed Au 9, 1963 v p 3 Sheets-She'et s INVENToRs.

United States Patent 3,190,134 HUB DRIVEN DEVICE AND MEANS AND METHOD FOR MAKIIIG THE SAME James E. Sadler, 3317 Park Ave., and Robert L. Haley, 3293 W. Lakewood Drive,both of MemphisyTenn. Filed Aug. 9, 1963, Ser. No. 303,715

7 Claims. (Cl. 74230.4)

hub driven device wherein the hub and the outward web portion of the device are telescoped and wherein these parts are interlocked through a deformation or extrusion of the hub portion by controlling the flow of the material to embrace the web portion of the device and to cause it opening of to flow into the inner peripheral non-round the web portion. a

A primary object of the invention is to provide a novel hub-driven device wherein the union between the hub and the surrounding portion obtains universal flexibility which accommodates deviations in the application of the device whether as a driving or a driven element so as to eliminate or materially reduce the fatigue stresses which obtain premature fractures in devices wherein the hub and the surrounding portion are integral or connected by common securing means such as rivets or bolt and nut assemblies.-

" A further object of the invention is to provide a'novel';

die assembly which incorporates a diametermaintaining punch which extends into a cylindrical tubing which forms the hub of'the device and wherein the tubing is confined within the die structure and pursuant to application of axial pressure on the ends of the tubing the tubing is caused to contract axially with coincidental displacement of the metal and a reduction in the axial dimension as accommodated within thle die cavity to cause flow radial web at opposite sides and hold the same normal to the axis of the hub portion.

A still further object of the invention is to provide a novel hub driven device wherein the hub portion is pro- FIGURE 3 shows the die assembly at the bottom of the stroke;

FIGURES 4 and 5 are fragmentary side elevational view respectively of the parts prior and after forming; and

FIGURE 6 is an enlarged fragmentary edge view partially in radial section.

Describing the invention in detail and having reference to FIGURES 1 through 3, there is shown a die assembly generally designated 2 which comprises upper and lower platens 3 and 4, the lower platen 4 being provided with upstanding guides 6 which enter into the bushed'openings 7 in the upper platen 3.

' The upper platen 3 carries the male die structure generally designated 10 which includes a clamping plate or member 11 seatedras at 12 against the underside 13 of the-top platen 3,-the said clamp member 11 being provided with a recess 14 receiving the head 15 of a punch generally designated 16, said head 15 being retained within the recess 14 between the surface 13 of the platen 3 and the opposed shoulder 17 of the member 11 which surrounds the shank portion 18 of the punch. Portion 18 extends through an opening 20 in the clamp member. 11,

and is preferably cylindrical and projects through a bush-v ing or sleeve 21 of an upper blank retainer and guide 22 t which at its upper end is provided with a radialflange 23 vided with an aperture having a nonround, preferably geometric configuration providing opposed areas at opposite sides of the opening which are spaced at a distance from each other substantially equal to the outer diameter of the hub forming tube portion which is inserted into the aperture, the aperture providing a series of cavities or notches intermediate these areas into which the metal is caused to flow pursuant to distortion and flow of the material of the tube as it is being formed into a hub within the web portion of the hub driven device.

A further object of the invention is to provide a novel mechanism for forming the parts into a unitary assembly and wherein the dimensions are critically controlled within very close tolerances.

These and other objects of the invention will become more apparent from the specification and the drawings wherein: r

FIGURE 1 is a vertical sectional view through the die assembly showing the same in open position;

FIGURE 2 is a similar view showing the die closed and the parts of the hub driven device mounted therein;

seated behind an inturned flange or shoulder 24 of a rebolts 27 and dowels 28.

The retainer and guide sleeve assembly 22 is reciprocal within an opening 30 defined by the inner periphery of, theflange24 and is movable into a cavity 31- against the resistance of the springs 32 which at one end bear as at 33 against the upper side or end of the sleeve-22 and at the other end each spring 32 being received within a confining bore 34 extending through the retainer block 11 and into the upper platen 3. The upper-end 35 of each spring 32 seats as at 36 against an upper closed end surface of the associated bore 34. The springs 32 urge the sleeve 22 downwardly in stripping relation to the shank 18 of the punch 16. The combination sleeve and retainer or holder provides a gripping end or surface 38 which in the closed position of th e'die engages the web or flange 40 of the hub driven device generally designated 41 and herein shown as a split pulley. The web 40 as well as the opposing web 42 seats against each other as at 43 and are provided with outturned or diverging peripheral annular portions 44 and 45 which form the V-groove 46 of the pulley.

It will be understood that the two-piece outer part is here in shown in the nature of a pulley, however the same could like. As will readily be seen from a consideration of FIGURES 4 and 5, the webs 40 and 42 of the outer part each comprise a non-round opening 47 which is preferably of geometrical polysided configuration to provide edges of tangency at 48 which contact the outer periphery 49 as at 50 of the hub or tubular member 52 so as to concentrically and accurately position the tubular member 52 with respect to the outer structure. At the same time the shape of the opening 47 provides spaces or cavities at 53 for the flow of the material of the hub in order to provide an interlock between the outer and the inner members, as hereinafter explained. 4

Referring now to FIGURE 2, it will be seen that the bottom side 54 of the outer part of the hub driven device is engaged as at 55 by the outer end clamping .edge or surface 56 of the bottom or lower blank retainer and guide 57 which is of tubular construction and which has a carbide or hardened and ground wear and forming sleeve 58 receiving the lower end 60 of the punch head 61 of the punch 16; It will be appreciated that-the punch head-61 is of smaller diameter than the shank portion 18 from which the punch head depends and that it is' of a diameter or dimension conforming to the internal diameter of the internal bore.63 of thehub portion 52. It

will be seen that'in the closed position of the die thatthe internal bores 65 and 66 of thesleeves21t and 58 are of larger diameter than the initial outer diameter indicated CD of the cold drawn tubing '52 and that the head.61

of the punch serves to center the entirechub driven device 41 within the die.

I It will beseen that. in order to obtain good closure and clamping action between the upper and lower blank retainer and guides, which are in axialgalignment with;

each other, that the lower blank retainer and guide 57 is spring-loaded by means of a plurality of springs 70 each of which extends into a bore 72 within the guide 57, and

7 seats against a closed end 73 iof thebore 72, the lower end of eachspring'72 'projectingrbelow the lower end-74 of the retainer 57 and entering into a pocket 75fandi seating as at 76 in the lower closed end of the 'po cket 75' which is formed in the lower mounting plate or platen 4.

g It will be seen that the retainer 57 isguided externally, by

means of aretainer-block 77 which'is securedby bolt-s 78 i and dowels 797on the top side 80 of-the lower platenfl,

the guide member 57 being movableagainst the'compression of the springs 70 vertically within the bore or opening 82 in the retainer 77 and being urged constantly of the hub portion 52 is prevented from flowing 0r col. l

lapsing inwardly because of the punchend 61' and therefore it is caused to flow'outwardly and around the opposite sides of the outer portion42 providing toetfe'ct an indentation at 106 and shoulders at 107 and 1&8 com-1r pressively'embracing the outer portions 40 and. 42. At the same time the material is caused to flow into the 7 pockets 53 to provide locking lugs which interlock (with the adjacent edges of the opening 47. r

It has been noted that withthis type of construction a superiorv juncture is obtained between the. hub 'and the surrounding portion of the device in that a 'fatiguereducing joint'is obtained which provides axial or lateral flexibility between the inner andouter parts of the device inasmuch as the union' although intimate maintains, a seam line part between the segments sutficient to'allow small flexing or relative mov ementbe'tween the parts when axial loads are applied to the parts; r s

After the structure is formed the die is separated and the structure is removed from the die manual.

,- stripping.

, It will be realized that the metal is compressed beyond, its elastic limit and that its partial recovery preloadsthe connection'of the hub with respect to the pulley flanges.

upwardly by the reaction, of the springs "70. The retainer 57s is guided internally by thelower forming punch V 84 which has a head 85 complementing fitting within a cavity 86 in the under portion of the platen 4, the punch 84having an upwardly extending shank portion SS which fits Within an internal 'bore 90 of the retainer-557.; The

7 beyond its elastic limit and having developed inwardly I of said ends enlarged sectionsat opposite sides [of the 7} upper end of'the punch 84 is providedwith an upwardly opened cavity 91 which receives the lowei end,6[t of the punch head 61, as best seeninVFIGURES 2 and 3'.

In preparing the hub portion 52 forrinsertion in the, i die the same is treated :witha' molybdenum-disulfide .7 lubricant, which permits the punch end 61 to be withdrawn from the formed hub portion 52 and thehublpon tion 52 to be extracted from the upper and lower' asser'n In other words the metal is in a state of compression and it has been foundthat this connection because ofsuch" Preloadingis far p rior even to an integral construction.

'What is claimed is: p a

1. A fabricated torsional device comprising aninner and anouter element, said outer element having a nonround' opening-therein; said inner element having ends compressively deformed by loading the element axially outer elemen't, includingportions expanded radially into complementary conformance with areas of-radialiali'gn ment in said outer element and, filling saidopeningthereyin and providingf a torsional interlock therewith, said blies 22 and 57 and particularly from the hardened sleeves 21 and 58:. a r 7 p r V In operation, the hub blank 52 which isfa mechanical cold drawn tubing is inserted within outer members, 40,- 42 and positioned in the die cavities 65 and 66 .and

sleeved over the lower end portion of the lower, end

61 of the punch. Thus in the initialposition the member 52 is within the cavity 66 and at its lowerend 100 seats against the upper edge 101 of the punch 84; The outer periphery 49 of the member 52 isrspaced from the periphery 66 and is disposed inwardly thereof and the member 42 seats as at 55 against the upper edges ofthe member 57 and the sleeve 58. The upper platen 3, is,

inner element being infa state of compression and said enlarged sections being under compression andfcompres sively engaging said outer element'therebetween;

2.1In a device of the. class described, a tube, an ohterq member including a portion having a non-round opening receiving the tube, a said tube :having an initial outer r diameter admitting the tube within the opening, saidtube": 7 including parts deformed solely through compressive loading of the tube beyond its elastic limit'and therebybeing enlarged inthe region of radial alignment with' said portion into a sectioncomplementary to said opening in torsional interlocking engagementtherewith and providing at opposite sides of the portion, shoulders 5 formed in engagement with the portion, and coincided- 5 tally with said enlargement being under a compressive periphery of the sleeve 21; Inthis position the lower a l edges 38 of the members 21 and 22 engage the upper member 40 and clamp the assembly together against the lower blank retainer and guide 57.- Thereafter the upper platen and lower platen are relatively advanced toward each other whereupon the'memberSZ is compressed and V the lower end of the punch 61 continues into thecavity 9 1 in the lower punch. The compressive action between it the punches causes the sleeveportion 52 to becompress'edj and flows thematerial outwardly so that the outerdiama eter of the hub portion equals that of the'bore 65 and '66.

It will be noted from a consideration of FIGURES 2 and 3 that the outer portion 41 of'thehub driven'device projects its inner edges inwardly of the inner periphcries Of the sleeves ,2]. and 58 whereabout the material load of an extent that said outer, part is clamped solely withlimited flexibility axially of the forces of compresj sion.

3. A device of the class described comprising a tubular center portion having ends and an outer portion having a 'polysided opening-snugly embracing said center portion; said center portion including an area expanded radially;

outwardly intermediate its ends at said opening into a section complementally fitting the opening ande xpanded 1 v to a diameter larger than the opening into shoulders 'em-' 7 bracing said outer portion therebetween at opposite sides of the outer portion, said center portion being under axial i a compression, thereby flexibly holding said outer portion between the shoulders under a compressive load sufl'icient to accommodatejslight axial deflection betwecn'said por-;

tions.

I, 4. A device of the class described comprising atubular center portionof initial" length and an outer portion having a polysided geometrical opening snugly receiving said center portion, said center portion having a shaftreceiving bore of initial diameter, said centerportion comprising a'section in alignmentlwith said outer portion expanded radially complemental to said opening and said tubular portion being under compression beyond its elastic limit axially from an initial length to a reduced length and including enlargement of the outer diameter thereof intermediate its ends providing shoulders at opposite sides of the outer part compressively holding the same therebetween, said inner part maintaining said initial diameter of the bore.

5. A pulley comprising an outer part including a pair of opposed segments each comprising a web portion with an outturned peripheral annular V-groove-forming flange, each web portion having a central transverse nonround opening therein, a hub member comprising a tube having an initial outer diameter smaller thanthe smallest diametrical dimension of said openings, said member extending through said openings, said member being under an axial compressive load beyond its elastic limit and including a section expanded radially outwardly in the region of said openings into a shape conforming with the openings to effect a torsional interlock with the Webs V and expanded radially outwardly of said Webs thereby UNITED STATES PATENTS 262,189 8/82 Trageser.

341,652 5/86 Goeggel 78-63 795,452 7/05 Richardson 74-2303 XR 1,203,459 10/16 Basener 301-63 1,706,118 31/29 Hopkins 78-60 1,800,567 4/31 Poole 218-1 1,800,664 4/31 Schultz 74-2308 2,146,461 2/39 Bettington. 2,170,472 8/39 Fitch 29-509 2,337,308 12/43 Buote 74-2308 DON A. WAITE, Primary Examiner. 

5. A PULLEY COMPRISING AN OUTER PART INCLUDING A PAIR OF OPPOSED SEGMENTS EACH COMPRISING A WEB PORTION WITH AN OUTTURNED PERIPHERAL ANNULAR V-GROOVE-FORMING FLANGE, EACH WEB PORTION HAVING A CENTRAL TRANSVERSE NONROUND OPENING THEREIN, A HUB MEMBER COMPRISING A TUBE HAVING AN INITIAL OUTER DIAMETER SMALLER THAN THE SMALLEST DIAMETRICAL DIMENSION OF SAID OPENINGS, SAID MEMBER EXTENDING THROUGH SAID OPENINGS, SAID MEMBER BEING UNDER AN AXIAL COMPRESSIVE LOAD BEYOND ITS ELASTIC LIMIT AND INCLUDING A SECTION EXPANDED RADIALLY OUTWARDLY IN THE REGION OF SAID OPENINGS INTO A SHAPE CONFORMING WITH THE OPENINGS TO EFFECT A TORSIONAL INTERLOCK WITH THE WEBS AND EXPANDED RADIALLY OUTWARDLY OF SAID WEBS THEREBY PROVIDING SHOULDERS EMBRACING SAID WEBS THEREBETWEEN, SAID HUB MEMBER BEING RESILIENTLY LOADED AT SAID SHOULDERS AGAINST SAID WEBS IN COMPRESSION AXIALLY OF THE HUB MEMBER. 